Official estimates indicate that about 5.6 million vehicles will be subject to the tax in the 2028-29 fiscal year. The Office for Budget Responsibility has certified projected revenue of £1.1 billion for that year. Revenue is expected to grow to £1.435 billion in 2029-30 and reach £1.865 billion in 2030-31. The implementation phase now includes legislation, payment infrastructure, mileage verification, refunds, penalties, appeals, and dispute resolution procedures. Motorists will start paying once they renew their vehicle tax after April 1, 2028.